Board Thread:Off Topic/@comment-30435697-20180420130425/@comment-32358261-20180822111756

Ok brief explanation. Basically you can choose any 4 Pokémon out of every tier (other than mega Pokémon)

By default you have 500 points to spend for all 4 Pokémon. However depending on the mega Pokémon you have chosen already, it will gain or lose points to spend overall. In your case you have 540 points to spend.

If you look above each tier, they are marked with points. Tier 1 costs 180, tier 2 120, tier 3 100 etc

Hope this helps